The KERDI-SHOWER prefabricated substrates are made of expanded polystyrene (EPS) foam with a high compressive strength. They provide a convenient, lightweight, and stable substrate for the KERDI waterproofing membrane and tile. The KERDI-BOARD prefabricated substrates are made of Schluter®-KERDI-BOARD. They integrate with the Schluter®-Shower System and provide a convenient, lightweight and stable substrate for tile with minimal steps to complete waterproofing. After the tile is installed and grouted, the assembly will support all the loads typical of tiled showers. This can include glass doors or glass block walls.